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print does not care about font size and lower all the size

hi !

i have a problem with my zimbra webmail. i don't know whenever it is a problem of server, of release but several weeks ago, it did not appens and now it appens withe every broswer (chrome, ff, seamonkey, ie)

here the problem :
when i print a email, the font size is already lowered , downsized..
i write a html email with 3 lignes, each have different font size.
i print it , and even the preview have the problem : all the font size are aligned to a very small size (the same like the email adresse, subjects..etc)

so , what is the problem ?

thanks for help because it is very boring in daily use (off course we don't print all the email, but it impacts the pdf too !!!).